Process for the production of solventless polycarbonate

Details Process for the production of solventless polycarbonate Process for the production of solventless polycarbonate

1991-10-10

1993-03-02

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524141, 528125, 528126, 528128, 528173, 528176, C08G 6364, C08G 6380, C08G 6382

Patent

active

051910012

ABSTRACT:
A three-step process for the production of solventless polycarbonate is disclosed. Accordingly, a mixture of two different oligocarbonates each prepared by the interfacial method, is prepared in the first process step. In a second step, the mixture is crystallized. The third step entails polycondensation. In an additional embodiment of the invention the first step uses a mixture of one oligocarbonate with a suitable monomer.

REFERENCES:
patent: 4102940 (1978-07-01), Thom et al.
patent: 4395534 (1983-07-01), Shimizu et al.
patent: 4645806 (1987-02-01), Freitag et al.
patent: 4740554 (1988-04-01), Kress et al.
patent: 4927903 (1990-05-01), Schreckenberg et al.
patent: 4948871 (1990-08-01), Fukuoka et al.
patent: 4973652 (1990-11-01), Ebert et al.

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